chore(deps): bump @libp2p/plaintext from 2.0.29 to 3.0.0

Bumps [@libp2p/plaintext](https://github.com/libp2p/js-libp2p) from 2.0.29 to 3.0.0.
- [Release notes](https://github.com/libp2p/js-libp2p/releases)
- [Changelog](https://github.com/libp2p/js-libp2p/blob/main/.release-please.json)
- [Commits](libp2p/js-libp2p@ping-v2.0.29...tls-v3.0.0)

---
updated-dependencies:
- dependency-name: "@libp2p/plaintext"
  dependency-version: 3.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

examples/js-libp2p-example-connection-encryption/package.json

@@ -18,7 +18,7 @@
   "dependencies": {
     "@chainsafe/libp2p-noise": "^16.0.0",
     "@chainsafe/libp2p-yamux": "^7.0.0",
-    "@libp2p/plaintext": "^2.0.0",
+    "@libp2p/plaintext": "^3.0.0",
     "@libp2p/tcp": "^10.0.0",
     "it-pipe": "^3.0.1",
     "libp2p": "^2.0.0",